iw: scan: add extension tag parsing

HE IEs are part of the extension tag (ID 255).

Signed-off-by: Brian Norris <briannorris@chromium.org>
Link: https://lore.kernel.org/r/20201118033936.3667788-2-briannorris@chromium.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/scan.c b/scan.c
index 8c23483ecede77da0a97b3ee0a82693f54b85412..58a09983c5c7a61aa3c8f93a713d5ea13c7a9034 100644 (file)
--- a/scan.c
+++ b/scan.c
@@ -2272,6 +2272,36 @@ static void print_vendor(unsigned char len, unsigned char *data,
        printf("\n");
 }
 
+static const struct ie_print ext_printers[] = {
+};
+
+static void print_extension(unsigned char len, unsigned char *ie,
+                           bool unknown, enum print_ie_type ptype)
+{
+       unsigned char tag;
+
+       if (len < 1) {
+               printf("\tExtension IE: <empty>\n");
+               return;
+       }
+
+       tag = ie[0];
+       if (tag < ARRAY_SIZE(ext_printers) && ext_printers[tag].name &&
+           ext_printers[tag].flags & BIT(ptype)) {
+               print_ie(&ext_printers[tag], tag, len - 1, ie + 1, NULL);
+               return;
+       }
+
+       if (unknown) {
+               int i;
+
+               printf("\tUnknown Extension ID (%d):", ie[0]);
+               for (i = 1; i < len; i++)
+                       printf(" %.2x", ie[i]);
+               printf("\n");
+       }
+}
+
 void print_ies(unsigned char *ie, int ielen, bool unknown,
               enum print_ie_type ptype)
 {
@@ -2290,6 +2320,8 @@ void print_ies(unsigned char *ie, int ielen, bool unknown,
                                 ie[0], ie[1], ie + 2, &ie_buffer);
                } else if (ie[0] == 221 /* vendor */) {
                        print_vendor(ie[1], ie + 2, unknown, ptype);
+               } else if (ie[0] == 255 /* extension */) {
+                       print_extension(ie[1], ie + 2, unknown, ptype);
                } else if (unknown) {
                        int i;